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/** | |
* Gautam Muralidhar,Srivatsan Ramanujam Oct 2014 | |
* PL/C function for invoking Canny's Edge Detection from OpenCV | |
**/ | |
extern "C" { | |
#include <postgres.h> | |
#include <fmgr.h> | |
#include <utils/array.h> | |
#include <utils/builtins.h> | |
#include <catalog/pg_type.h> | |
#include <string> | |
#include <vector> | |
#include <stdlib.h> | |
#include <stdint.h> | |
#ifdef PG_MODULE_MAGIC | |
PG_MODULE_MAGIC; | |
#endif | |
// Postgres interface for getImgSizeFromByteStream | |
PG_FUNCTION_INFO_V1(get_imgsize); | |
Datum get_imgsize(PG_FUNCTION_ARGS){ | |
if (PG_ARGISNULL(0)){ | |
ereport(ERROR, (errmsg("Null arrays not accepted"))); | |
} | |
// Collect the input image byte stream as C string | |
char* cstr = TextDatumGetCString(PG_GETARG_DATUM(0)); | |
string str(cstr); | |
vector<string> tokens; | |
// Tokenize the string on “,” and collect the tokens, which represent individual bytes of the image | |
Tokenize(str, tokens, ","); | |
vector<int8_t> src; | |
for (int i = 0; i < tokens.size(); i++) { | |
const char* tk = tokens[i].c_str(); | |
int bt = atoi(tk); | |
src.push_back(bt); | |
} | |
// Call the internal getImgSizeFromByteStream function | |
uint* imgSize = getImgSizeFromByteStream(src); | |
Datum* imgSizeArray = (Datum*)palloc(sizeof(Datum) * 2); | |
for (int i = 0; i < 2; i++) { | |
imgSizeArray[i] = imgSize[i]; | |
} | |
// Construct the array to be returned back to the database client | |
ArrayType *res = construct_array(imgSizeArray, 2, INT4OID, 4, true, 'i'); | |
PG_RETURN_ARRAYTYPE_P(res); | |
} | |
// Postgres interface for edgeDetectionFromByteStream | |
PG_FUNCTION_INFO_V1(canny_plc); | |
Datum canny_plc(PG_FUNCTION_ARGS){ | |
if (PG_ARGISNULL(0)){ | |
ereport(ERROR, (errmsg("Null arrays not accepted"))); | |
} | |
// Collect the input image byte stream as C string | |
char* cstr = TextDatumGetCString(PG_GETARG_DATUM(0)); | |
string str(cstr); | |
vector<string> tokens; | |
// Tokenize the string on “,” and collect the tokens, which represent individual bytes of the image | |
Tokenize(str, tokens, ","); | |
vector<int8_t> src; | |
for (int i = 0; i < tokens.size(); i++) { | |
const char* tk = tokens[i].c_str(); | |
int bt = atoi(tk); | |
src.push_back(bt); | |
} | |
// Call the internal getImgSizeFromByteStream function | |
uint* imgSize = getImgSizeFromByteStream(src); | |
uint* edge_result = new uint[imgSize[0]*imgSize[1]]; | |
// Call the internal edgeDetectionFromByteStream function | |
bool success = edgeDetectionFromByteStream(src, edge_result); | |
if (success) { | |
Datum* imgSizeArray = (Datum*)palloc(sizeof(Datum) * imgSize[0]*imgSize[1]); | |
for (int i = 0; i < imgSize[0]*imgSize[1]; i++) { | |
imgSizeArray[i] = edge_result[i]; | |
} | |
// Construct the array to be returned back to the database client | |
ArrayType *res = construct_array(imgSizeArray, | |
imgSize[0]*imgSize[1], INT4OID, 4, true, 'i'); | |
PG_RETURN_ARRAYTYPE_P(res); | |
} else { | |
ereport(ERROR, (errmsg("Edge detection failed"))); | |
} | |
} | |
} |
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